its going up because gold is spilled on players, no more gold is needed by most players except for BC (gearing is over) and there were lucky moments that spilled even more gold on players
also, every smart player spends all his gold on BC now to convert it back to gold once rate is even higher... win just by waiting....
On the other hand there's no currency exchange on p2p.
still, those who get access to payserver with BC farmed with gold will get in trouble a bit maybe (im not 100% sure about this)
and i rather have an expensive goldexchange than using real $